WPF ComboBox 项目在 Visibility.Collapsed 之后保留在列表中

Question

我遇到了 wpf ComboBox 的问题。我首先添加了一个文本框作为第一个项目，用于我的过滤建议然后我通过 Foreach 循环在组合框中添加了大约 20 个复选框。像这样

现在当我过滤掉它们时（我检查是否为真然后 Visibility.Collapsed）它们的踪迹仍然在 Combobox 中，就像这样

请记住，项目是一个一个地添加到组合框中的像这样

DataTable machinesTable = machineModel.GetAllMachines().Tables[0];

List<CheckBox> list = new List<CheckBox>();

foreach (DataRow item in machinesTable.Rows)
{
    string ID = item["ID"].ToString();
    string manufacture = item["MANUFACTURER"].ToString();
    string model = item["MODEL"].ToString();
    MachinesComboBox.Items.Add(new CheckBox() { Uid = ID, Content = manufacture + " - " + model });
}

过滤系统是这样工作的

foreach (object item in MachinesComboBox.Items)
{
    if (item is CheckBox)
    {
        if (((CheckBox)item).Content.ToString().Contains(MachinFilterTextbox.Text) || MachinFilterTextbox.Text=="")
        {
            ((CheckBox)item).Visibility = Visibility.Visible;
        }
        else
        {
            ((CheckBox)item).Visibility = Visibility.Collapsed;
        }
    }
}

Answer 1

您应该查看 MVVM design pattern，但作为快速修复，您可以设置父 ComboBoxItem 容器的 Visibility：

foreach (CheckBox item in MachinesComboBox.Items.OfType<CheckBox>())
{
    ComboBoxItem container = MachinesComboBox.ItemContainerGenerator.ContainerFromItem(item) as ComboBoxItem;
    if (item.Content.ToString().Contains(MachinFilterTextbox.Text) || MachinFilterTextbox.Text == "")
    {
        container.Visibility = Visibility.Visible;
    }
    else
    {
        container.Visibility = Visibility.Collapsed;
    }
}

WPF ComboBox 项目在 Visibility.Collapsed 之后保留在列表中

WPF ComboBox items stays in the list after Visibility.Collapsed

c#

wpf

combobox

visibility

filtering